Discussion
Three of the following make a residue harder to use. Which makes it easier?
Arising concentrated at a single mill
Very low bulk density
High moisture content
Scattered availability across many fields
Answer: C
Correct answer: Arising concentrated at a single mill
A residue arising at one point is far easier to use, because collection is the cost that defeats most by-product schemes. Material that appears continuously at a mill can be handled by conveyor with no gathering cost at all.
The other three all make use harder: a very low bulk density inflates transport cost per tonne, high moisture rules out combustion and forces a wet route, and scattered availability across many fields imposes exactly the collection burden that concentration avoids.
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